The Lawn Man

Brown Patch

Caused by: Rhizoctonia solani (Kühn)

Brown Patch

Plate 1: Brown Patch symptoms

Description

On close mown turf patches of water soaked grass develop. The patches become tan to dark brown (Plate 1). In humid conditions a brown/grey 'smoke ring' may develop around the edge of the patch. On higher cut grass a light brown patch forms. Individual leaves may have lesions that are tan in the centre and bordered with a brown edge (Plate 2).

Brown Patch

Plate 2: Brown Patch lesions on tall fescue

Where is brown patch found?

Brown Patch is not very common but it is most frequently seen on close mown areas such as golf greens and bowling greens.

On longer grass lesions may be found by close inspection but it is rare to encounter patches of disease

When is brown patch likely to attack turf?

During the summer months, when the temperatures and humidity levels are high.

Effects of Brown Patch

Brown Patch reduces the aesthetic appearance of the turf. In severe cases grass cover may be lost in the patches

High risk situations

Temperatures over 20°C

Leaf wetness or high humidity

Poor surface drainage

Excessive fertility


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